Why would that be a problem? If a weapon doesn't have a role, it shouldn't be on the battlefield.
I don't think the classes should be balanced. If a spearman wants to fight up close, let him drop the spear and go to his secondary weapon.
Why would you completely remove an extremely important aspect of melee combat historically because longspears can hit closer than they should? In a game where every polearm can hit closer than they should and any stab can hit at face hug reach. A longspear does have a role, it is a support weapon and if you think a longspear offers even remotely as much utility as a 2h up close, you are mad and clearly never tried a longspear yourself. Hitting up close is easily countered with downblock, deals crap damage and requires a lot of effort. Besides, it is extremely hard to fix. The pike can't do it, it can stab straight through objects and teammates instead, yay.
If this is a realism argument then I got a counter for you. The thing about long spears in real life is that they can keep opponents at bay, they are always solid objects able to push and stab. In Warband they are not solid objects and can only stab, something which can be defended against much easier against than in real life as well. As soon as you downblock there is nothing to stop you from facehugging the longspear user. The only reason people use facehug stabbing techniques is because closing in on them is unrealistically easy.
Before someone implements the aformentioned brace (couch) animation for pikes and long spears, they will likely stay as they are. Imo it would be great to have the ability for pikemen. You could defend tight spaces and corridors with just a few pikemen representing an actual pikewall formation. And against one pikeman you can still chamber the "couch". The angle or turn speed has to be limited of course not to make it too stong, but it already seems to me that the lance couch has a really slow turn speed, especially with the great lance, so I guess that would be possible.
I literally do not understand how you can see bracing as a useful thing in cRPG. People would just walk around you or shoot you in the face. Why would you willingly abandon all movement to become a wooden stake? For realistic pike use, you should be able to brace it while moving but I don't think the engine supports that kind of hit detection. Thank fuck MBG will.